EchoProcess + Support UOMs + Support BBOX

[fmigneault]

Changes

• Add weaver.formats.ContentEncoding with handlers for common encoding manipulation from input values.
• Add |oap_echo|_ to the list of weaver.processes.builtin definitions with its CWL representation and
  complementary OGC API - Processes reference implementation details. This Process will be automatically deployed
  at API startup, and is employed to validate multiple parsing combinations of execution I/O values and encodings
  (fixes Implement example process #379).
• Add support of OGC BoundingBox definition (bbox and crs fields) as Process execution input value
  with appropriate schema validation (fixes Support of BoundingBox I/O #51).
• Add support of Unit of Measure (UoM) definition (measurement and uom fields) as Process execution
  input value with appropriate schema validation (fixes`Support I/O literal with unit of measure #430).
• Add create_metalink utility function to facilitate generation of a .meta4 or .metalink file definition
  from a list of file link references (relates to How to handle "multiple output" #25).

Fixes

• Fix weaver.wps_restapi.swagger_definitions.ExecuteInputValues deserialization that sometimes silently dropped
  invalid JSON-formatted inputs that did not fulfill schema validation. This was caused by a side effect regarding
  how weaver.wps_restapi.colander_extras.VariableSchemaNode handled "unknown" JSON properties from submitted
  content. In cases where required Process inputs were causing the invalid schema, Job execution would be aborted
  and the error would be reported due to "missing" inputs. However, if the JSON failing schema validation happened to
  be nested under an optional input definition, the Job execution could have resumed silently by omitting this
  input's value propagation to the downstream CWL, WPS or OGC API - Processes implementation, which could make
  it use an alternative default value than the real input that was submitted for the Job.
• Fix schema name representation employed in generated colander.Invalid error when a schema validation failed, in
  order to better represent deeply nested schema using multiple oneOf, anyOf, allOf schema nodes.
  Using colander.Invalid.asdict, each dictionary key now properly indicates the specific path of sub-nodes with
  their relevant schema validation error.
• Fix variable schema node names to provide a {SchemaName}<{VariableName}> representation, such that it can be
  more easily identified. Schema nodes with a variable (i.e.: schema under additionalProperties) previously only
  indicated {VariableName}, which made it complicated to follow reference schema classes that formed the error path.
  Each of the evaluated fields against each possible variable schema will now report their corresponding nested
  schema validation error as {SchemaName}<{VariableName}>({field}) such that results can be understood.
• Fix execution input reference (i.e.: using href) dropping a schema URL reference if provided explicitly.
  This parameter now remains within the produced content passed to the Job, and forwarded to a remote Process if
  applicable, but no further schema validation is accomplished with the value in schema for the moment.
• Fix ContentType.IMAGE_OGC_GEOTIFF using invalid media-type name (missing i in image).
• Fix Job input validation stripping additional parameters from provided Media-Type, potentially causing mismatching
  Content-Type validation against the corresponding Process description inputs. Types should now match exactly the
  original Process definition, including any additional parameters and sub-types.
• Fix resolution of anyOf schema raising colander.Invalid even when the property was marked as optional
  using missing=colander.drop.
• Fix $schema of OGC nameReferenceType being reported under every dataType of literalDataDomains for
  literal I/O of Process descriptions. The reference is not only included in the OpenAPI definition as intended.

References

• Relates to Add initial CWL JSON schema definition opengeospatial/ogcapi-processes#329
• Relates to Inconsistent schemas in DRU extension since OpenAPI restructure opengeospatial/ogcapi-processes#319
• Depends on fix invalid supported UOMs description geopython/pywps#686
• Depends on prepare release 4.6.0 geopython/pywps#689 (pywps==4.6.0)
• Depends on fix CRS for non-int code by URL geopython/OWSLib#897
• Depends on fix CRS for non-int code by URL geopython/OWSLib#898 (owslib==0.30.0)
• Depends on drop support of EOL python 3.7 #586 due to pywps and owslib updates.
• Resolves Support of BoundingBox I/O #51
• Resolves Implement example process #379
• Resolves Support I/O literal with unit of measure #430
• Closes Implement the example EchoProcess from OGC API Processes in CWL #541
• Closes unpin owslib to allow latest minor/patch revisions #577

To Do

• Fix issues related to Support Python 3.12 #587 (blocked by upstream dependencies)